Right way of interaction between PHP and javascript?

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Hi, everybody. I have a login form which is, after submitting, being validated by PHP(checking the database etc.). Now, I need to send feedback to user (login fail or succes) by using Javascript. What is the right way of doing this?

What I have tried:

So far, I know I can do this by simply echoing the script that calles javascript function (<script> jsFuntion(message) ;</script>) or by using AJAX. But I'm asking myself what is the safest and the most correct way?

Posted 30-Jun-16 2:05am

PeMaCN

Updated 30-Jun-16 2:34am

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Prava-MFS · Accepted Answer · 2016-06-30T02:34:00

I think, the best way to solve this problem is to use 'SESSION'. Store the result (whether success or failure) in the session as sort of a flash message.

1. Set a session message after your operation in the process page.
2. Then in the redirected page check whether the session message is set or not.
3. If it is set then simply echo that message.

The below code may help you.

$_SESSION['message'] = '';

// In the process page, where you are checking for the authentication
if (logged_in) { // your logic for authenticating user
    $_SESSION['message'] = 'Success';
} else {
    $_SESSION['message'] = 'Failure';
}

// In the same Login page (if it fails) or in the Dashboard page (if it success)
if(isset($_SESSION['message'])){
    echo $_SESSION['message'];
}
?>

I hope this will help you.